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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6966d953840005f32e387184fac604b3f3a5a28ffc98ccc9cc77cf4e9ef301b' 
  AND token = 'h0DVp0GTWFGVRwnBKjyfvMTWd8VRQolPL49u0/B04iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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