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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc01eace060fbbcefb56fe4ecfd55b4f31034ec6785b6d6b8a8099c4aee0532' 
  AND token = 'OCqgZjVdHEfqQHuRyVD/KYEV4cGkmip0zIjk41Azj+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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