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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c97fab663a52b2a2170884aa53568d3a950a5d8fbd316e8f98c78bb9c6982e' 
  AND token = 'gpV31ynbL+MeNlqouvlAA5ckCyvB4e4c9lFzLzh9p+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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