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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61caf3b7b24bea5c444c40d0ed79050aad767230db1a8a86ca805d57fb908ab8' 
  AND token = 'NM10PT7u737wYXkbHWd4D1S+urTVQFFD6qecY8kqnIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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