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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1d007cb1d08ff182006cdd6161d4da9c175c78c70e64498bf844f0d1f987d8' 
  AND token = 'iWdjD7XxKvcgHs3AddGyERJcMak/WP4v6xqgbp0ZRBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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