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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42a229756c465698fed8a60b99e65e5bc7f0d010aeaab04347ce6f3d5af8ed7' 
  AND token = 'O9219+tp+h7v0PfHU9MqYsL0YMSDhKZY21P+9oPc6fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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