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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995c035f32f1a8ff8154cd219dc684e593317d313fd7a5ef6419a930e2a7017a' 
  AND token = 'dEY6dV3yTeS0oJuwTY7KKpIlFhxFpJ3bmQScRWJsTBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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