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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a625bb1435e01ca07f013ebc56f99e9ac6aa8a8a772fd281c069042a4a727aa' 
  AND token = 'OBkZ2P8DLXm5kGa2CJbmPqPjULcREQkM3HerqNYR82s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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