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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aba050d12282f75b9f7550ae74c67fb0daf5e7cecbdad5cd98cb1fce651b101' 
  AND token = 'F48KGyriz0rKAcm1V8QwuQlEHnpXMwhRT4BWPzHElZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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