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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba1caf09f16ea3ddb32e1350c813708c83981aec95a948baa7bab77527276b9' 
  AND token = '06RuLPXSkuuWs1ygDpyJzDvlrNdZ9TzebnnUqyY+79w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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