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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db15dd0c6a3ed3baaf9d9a91af67345b60bea2321dc490f9b95d981ddf7c7b5' 
  AND token = '+F3lI/ovXs/CHTgi2z1OX8EnfIPESnkS8HeD9itcHHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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