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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee4e396a788b06041967194c8b432141677531a2e47150b7462b69386ba37dc' 
  AND token = 'VZtoBZ8626Roy7nQJih6PgCaz3CSeSV0n4fB4JBoNHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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