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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b62ae7f7564582ae10e898dbd8db1e92bc727be58e9b2df6ee1cc481c7cdc3b' 
  AND token = 'C/+jeDvgDBuyDd3P4dq8c6FRveQ5HWf2T8GWcsEoU+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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