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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe61968e050bbbc0363b898deba5f0067d082fe81f7f03f598cf97761cf2b91' 
  AND token = 'sOE+6/K79VjDzHRr/PH0QWsqFzE1c4W5f4vl6nuGdhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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