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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440554b842186261f1a9d9a4cb48954b70840cae1d4d6b27ed17a1d27f833c0b' 
  AND token = '5meFcAgymQbF6uz19co9cGunY9w1P/1DzXREQYL7BjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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