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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66aa1932a618e827f824e3474f07b12ec8452494a88f6b9f6648745651e7175' 
  AND token = 'Wbbl57+WxkMmSo4WE8ByDtR9mTmTXcGyZ5lxnvUSc4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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