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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7754803180d0fba3fb29aab84cc93b93abbe324f86290edeef8916676b693fc1' 
  AND token = 'AvAtsD2/tz4jh3O9d0Ee6Xy9lW3TnBIZHTB97Ji7J5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}