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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544514122f707c0727de717cb61470cdad45c24d13d828ceb1a4cd85b864edcd' 
  AND token = '5oNq0fSm5EwNlHOiMgt4ExymjEdjCJEkk0uoctUP/Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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