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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ada387618942c3c9193043c40fb0a1fd71f0658943db25f3cc767c62016ce38' 
  AND token = '/vilzaurc56xzIrovK+5l7b4tkLiJtoNTsnmosKrlqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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