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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231822ec2baf56cc10ab439013e16a4a5cf99a6d32b5c12b5967cec83cc6ee49' 
  AND token = 'QmjejwgTN6Yb5klWcHuNXxpJmAbD/lsZc5HHp4Zc/HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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