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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e42806a048aa6a0b87bf3b0f7922db5a269eb8022031f7ecc7e59d3ab84f5b' 
  AND token = 'KmvjfAqlgI3eRkpy2Eu6bal8Mmt028o4SPWNmCE/W1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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