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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d6e0437cef5d96230d57af99103a35e49cfc1336da5f1a5dc44936532a9647' 
  AND token = 'GGFgXPbUuiUQizyXc2wyezA/tTkMtmqIrKLuMI6zM94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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