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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78786bb73882dd22e092eb477346c29e29cd6d777d056fd046a10e01931761f1' 
  AND token = 'xAl75k6RxddPxBn9964tZUIW8lebPnTVq9T9hzuh/es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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