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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f59550c0cf1875832c21538c75fc82bbdfbfbf8e0e5aa0f6b9bda00fe107f8b' 
  AND token = 'ZbPlG/anIS3pfh3hOpktz5WSBdFyzpwa0txqrqZixck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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