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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15f5eb8f1e98410d42517fbccd97b24cd4f9df94861b44c76c91175d5a1c507' 
  AND token = '8yygK9aKHOIZK9/frktnH/yRskkaRNBDhblb0J/dlZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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