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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0903bdb4632434caa7dba56c284d5df73519c583e3feaaa0c43627c367de036' 
  AND token = 'vImA3tpi5mAR146Uz4Hpjz8jGOY3xV4AyAu5IRqYX64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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