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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0906a41b5618aed746f83f8579d734eae363febae9fc8180805f24d2133a6de6' 
  AND token = 'BFsoEjiU68jk8BmnJR8GFH4KEd/4bnl+/7jQWItPj+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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