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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548a0d66907196c3c3ca5cef657514dfc5476432ad1e66a47acba0009e24e900' 
  AND token = 'xbZyNusBbCqnRY2SX/vacd18P2kS2uWfYW8HN6i/9Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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