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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76e09ac359e40ede64fb317f1bebfda7227ffe96117c457d8a89b6b5b773dc9' 
  AND token = 'sUXOv9icU3j48DJ1c7B5+iGJDw7DsByiZ5624lXnFGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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