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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd235bf64300ea4d3ce423b4d5229c999c120a0a41b098d48704c2ac194ce2dd' 
  AND token = 'Of5567k1Lz413y37dmIjlGx2EHKhmZImPp3gUPlx39s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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