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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c37db03b1874b0ad462bebabcd399f69fccd6fd9a9c77e14cfa0420b647cbbe' 
  AND token = 'pwoKv9TlGE83UXOQFgJGGJeFD5e8fYpwt1dsW4L5UM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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