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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e1050ed7315213bf97dd28764ed63ab7fb9f63bebb8fb121a77511c5ec4841' 
  AND token = 'boUTGJ4NT3gfcTgJ5I4+Tqobh+frSH7BdIUPTkv8cds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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