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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d257d99d44d48f483dfc2eb62acd7d51ebd0d7acae89f8cacf336270d6e020' 
  AND token = 'dVnKbU/cIhr7Ve/j0n1jUBsBQCPNIsb6BvV7/BUcBkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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