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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53596b1bf36c7cd1ecbd9cf53c35ed470531d618ea36641cf064cf1c9a185e41' 
  AND token = '7ku7m58u7vSlVlTJO8iL2GK9fEhx8Qos+kqIMWybfXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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