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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2482f3e730106bd8c5ef80833ef1dd3d85fab6ee0b0e0ee1dc88975246d3ab9a' 
  AND token = 'qrEyTnY/fV4XRmigNE4LkqD0KyMUBbySPmJ7f+KKf2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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