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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18b02cd09e913ee59cf9a5b5faa4e20f9d7637f49493941cdb1de1c2fbc75c8' 
  AND token = 'uj48Pqhfjv1JK9HI8auJzDVdd0qVuFTeArq2yTAbf6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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