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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ed606443f1b93c1318623a26be8f17f26f369b17622abba7503fc185a374e5' 
  AND token = 'pOn0kPzjmOi9eMwNS824mX8yDDf3QdcpYqw4pLuAPfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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