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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b93cba08940849d9ce3f95b94af5ca5e54b531dd20f9cbff61dc64595f1586c' 
  AND token = 'wdbsL5pZMEw1O9/JmYme0rT52Jl0rlq+zBKa6h3tKvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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