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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdfd642f6ecf965caa4d7912896b520685407f0dab31b344fc1db9f19d4833a' 
  AND token = '5QT6MAbudANWVV35XVR1aGCLUATMQiFKjs3LEpAxSCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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