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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7dd8e9dda4b6d56b4283ed8b79f683e0c51682054aa9a09e9ef792c44162b5d' 
  AND token = '+3XWe3POWTvCaQi9ngTR8FSavc7FU5dtY1e7S7MX6bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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