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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff3fff5024b467a52203d6eb8b695faaede8046a14a8b9a9a32f29748ad55fc' 
  AND token = 'ZoBROSod1eA5u2HSrl34v3A3tDj94ZERDqvaH1KDdPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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