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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6976a7e0cb720c76da58bedb83f9c37a6cef40c3c828ad9a96f03bceadc746' 
  AND token = 'NlP5mg5tjDkDZ1xO2Oh85UUKa12KcSFVHoGGUegLpU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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