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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f2bd37c3e16e47f81cfe3beb81e823c51fa612c9682d2bb2d7298a1114e4be' 
  AND token = 'H9b8MEGI6bq9heuyQGkw6hAFlWPMUuGcFRwirckRQBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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