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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99961d00aff3c280832ffaf229260840c0d97e3eead8c82f8e5f7b8ae7d8c03' 
  AND token = 'MNp4f2PLnPoy9xhscO5sSinlzj2dJn++eSH95Mswi/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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