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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9892b338b4d04b22ecec2801b63dcfb80654cdcc18cb600035cc07125f63ef6' 
  AND token = 'd1S3SIuin91lPIXV42HL3MiIzY9y6ccEs/rPuZdk8gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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