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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbffc48d9b2f222f8260180a3efd7764967ee1ecdc0c3c7a1baf80d75bc42b72' 
  AND token = 'hwJsMDg8NJBy3SQPaA5/roL7ck2UYKi3SPBq782XHZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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