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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3676a1cc2b0ea00085abef1308d7c9ac81e94a756c6a1527ec5ad95c32847c82' 
  AND token = '0ANlrpx6IIa7mt9Bi1gnlyKHxdk7A4xnmZpQqwXMCjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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