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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0487d0de55f35ddd4bf57025162c08e9eb62255df4a5e947b584512bfd5c6d' 
  AND token = 'x1T8vBGNd041gq2FHWI5teia7Y8oE3iGYJS0HeNLinw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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