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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e013f4f928415cf77a77c365684eb1fd4924c841e122755817577f8de8f6962' 
  AND token = 'x7EoiN3H3xF/Z6fbh8Hh1pit0qPG7UuazmyRlrzP2JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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