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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea45b7e2b6eb5d87222ff4ba01af783a1f5a5b8e5f4c73bb5eeef1cd10ab8c7' 
  AND token = 'MzsgVA9Zx88Phd6HDP44N2o1StQ0Eecr6WnPsCLHo4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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