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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42e8d31c6d4ab4275ca3b1dc97e1e9744a5eb6cede2b2b1d20ca8c034df1a08' 
  AND token = 'iWu8plVPFNKKVVeoq2Oirvlaa7rAuIZPOWU5nlv8Zcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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