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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c3eef36e98dc661909c6ba532b3b43d2ac4e9a5a3916337f5f5adf248f1bd5' 
  AND token = 'QxdpMBXShSGfEAvrl9GsVdR+HvP5dCLC5x1aLICAdig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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