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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f8bdddb940764f88405180687161bb11d4b18d006409b9225b35ff639a64b6' 
  AND token = 'yPQGdXpDKFRyWZXvqhb66bMV2nA9R2uk/iuWPnWldng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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