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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890d190e560f55336c4dcd4d9581bc62a50ab888d8f6ddf9da16d993fd030bde' 
  AND token = 'Lntt53JKrA+N73SoVy8ROrL81jTrrkxZ2T+8mJQeRjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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