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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b793374fa9ea7d282da92899117d6652b9be8f99d14934e68d085ba5750359c4' 
  AND token = '1FfAcQKIza2CIKCD3EQBzDhyMQmjF2IN/phns6tsZRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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