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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155e3f015fc8d33e22ec050f93e7e6d388f31c5cae486f613a2000739f269abb' 
  AND token = 's0O86hckduFjmmYf/YajGQFsS1dSaAzPS0RbAjMMTvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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