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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c08b9d0ce6b494b2d0b704a306440c0df0112feceb2718b71d3fbc5a2d2ca5' 
  AND token = 'FSBWXi5edEzoVARFlahgWIX575RDOfk9OoKLi5ljqoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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