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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ef852c57fc1f809ea59f0cd12830dc6e65d2b75446bf9461226c4e00f76dcd' 
  AND token = '3ja6b4YwgoPdI574ytfaKx+OUGKdiffl5UopTVHGnyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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