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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aceafabfff094767d421e3c6d1e5a9ae9a7ea5c759389ba560b0066fbd41865' 
  AND token = '/inWlnZ5of9qFb2RioQyqcX9p8xnI8NaPlA38qMuYE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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