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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57441efc36007b96d99d74cea3671c621280c9ac630502f70cfbea6643c02003' 
  AND token = '4AlVrNyb5U3JX5lE1+8JlehJC/J1KoQNawKT8Xb2FoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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