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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f544a2726c48472ed5068ac465c773c69eec243c8b6c5f7f14668e1a2ce36b5f' 
  AND token = '09+dt67rrzU4MykwHp5tnlg8hNl7CaueW5bvirKhtyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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