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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddfdcf75bf58d24fabcdf706aef8a5ce699de5952658699196e13fd3b455cbc' 
  AND token = '2JNcZmPZQfORvwkho27WwUcqhuIxVAy0AGNDrk+4b0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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