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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0cceddcb8afd54a15eb265c1c971f495fc36b7781de1b95940c622f9ca20915' 
  AND token = 'oavsYSktoyhBD8/AFaqfx+IO0HqUIv1hagsXgL3iZjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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