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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b06a627754ef46d423f8ba28f9f7d3b70d87a7e7581c4ea39a214a505121da0' 
  AND token = 'U9yokD+e65R/KKivYLbdkbpkTH2KH4sQjMpO8WduW08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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