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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05573a10cafd2956a8c909483abba99753f82733222c0cd1cac91f6069b268f' 
  AND token = 'smsQULwFyWJ33BdkwkbhJW5kZSmjfp0+rIJEmmlzdFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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