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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee03bf7452060920d167af8dbcc0fd1259c86ff4b73d7daae4eb5c83ae47a35' 
  AND token = 'Vgrko5SpwQHRF7QlqbVD/ntBI4UmkzYV2A9/3iQSizE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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