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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c28e61e8a6d6c74a0da90fd283319e99989cf4efa6981696b002cb807d83942' 
  AND token = 'JkkMEfTDMu1ZvrgUpmW9AiOigqSOdbEYVuG/K5sFSk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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