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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30edd385633724313f02b6241eebcc2ef807d49a677f377f160920a6f7b3c85' 
  AND token = 'Qn8hTPNS+Gl7NaX6LyuYtnU4TU4QFse8D/EBWHIM5gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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