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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0d61af33dd58643035745f74f73a6af78b3d76f13af7ba5908a773d4741b8e' 
  AND token = 'SF5gKx/7j2NHctQiGycrI/MH9wSbyxJ7VTfztq4khI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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