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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed5567b2e6b910a8f7ed86ce737e2a8bbf0ef87bae733874275984cc474241a' 
  AND token = '/eDAYMp57G7AjxJJUaBED5k46DuCOSbJW4ovFmkNC7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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