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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdae25fb8033a6f864b702352c347f0a5c2c0a3b21629d5ccd9ffec08c16fa91' 
  AND token = 'hUjvGMuKaxIOY9Oe1qNti07B6UU5KK9n4O1YmuifvQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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