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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c1442c00d87663cce74a4ed0c0ee4d710348cd3a498e93fc8e2a75b09ba2f7' 
  AND token = 'nN96L/SEC3/4U76H8L1b8dn4FHmJeg1JjhUZ+PiDSNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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