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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ca8664c5ea3cbd3961d5fc6d7d8b7b69cbbdd69f2f83fbeec4cbb7afefd2e2' 
  AND token = 'YvRPMsZLzlK0o84Bf7+y3F2Oqzj0zRPvj2xS8m1mz1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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