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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099f69cfc11a943f9cacc6139af3831f99fc8acc13d50dc153cc5283079d4b59' 
  AND token = 'A3lK8vbi+QBU32uK/V5fe99N5w6lOpamyYgbl9cM47o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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